4 ports! Yes, this is its unique feature and makes it one of the most admired USB hub. Just plug it in wall socket, and use all the four ports via USB cable connector and charge or transfer data for 4 devices at one time. Its features include adaptors that can be used in the UK, US, AUS & EU, it has an input: AC 100-240V and output: DC 5V/2.1A which is split across the 4 ports, it is also CE certified.